diff --git a/include/linux/serial.h b/include/linux/serial.h
index 13f23c7ef3764cc7062b15934c6a576122e0de67..d9d93ae8ad3b7778fb714b18633a90d2faefdb0d 100644
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -80,7 +80,6 @@ struct serial_struct {
 #define SERIAL_IO_PORT	0
 #define SERIAL_IO_HUB6	1
 #define SERIAL_IO_MEM	2
-#define SERIAL_IO_GSC	3
 
 struct serial_uart_config {
 	char	*name;